Prevalence of haemoparasites in sheep and goats in tropical climate of Tamil Nadu

Jayalakshmi, K; Selvaraj, Periasamy; Veeraselvam, M.; RAVIKUMAR, R; Saravanan, M.; Venkatesan, M; Ramkumar, PK

doi:10.56093/ijans.v92i4.124050

Cited by 4 publications

(1 citation statement)

References 8 publications

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“…The aforementioned research ndings align with analogous investigations conducted byNangru et al, (2023) andIsmaeil et al, (2023). Similarly, in regions with tropical climates like Tamil Nadu, a study conducted byJayalakshmi et al, (2022), indicated that 70% of examined sheep blood smears tested positive for Theileria spp. The Shujaabad area, district of Multan, Punjab, Pakistan, observed a prevalence rate of 3.7%(Riaz and Tasawar 2017).…”

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confidence: 85%

Cross-sectional study on prevalence of theileriosis in Kendrapada sheep, Odisha

Mohanty,

Acharya,

Mishra

et al. 2024

Preprint

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Ovine theileriosis represents a significant threat to both animal welfare and global agricultural productivity, particularly impacting economically disadvantaged farmers. Vector-borne haemoparasitic diseases like theileriosis have a profound effect on the health of livestock, leading to increased illness and mortality, especially in the coastal regions of Odisha. This research aimed to investigate and comprehend the prevalence, clinical manifestations, hematological and biochemical parameters, as well as molecular aspects of theileriosis in sheep from Kendrapada. Among 148 blood samples collected from Kendrapada sheep across four blocks, 13% tested positive for theileriosis, indicating a notable prevalence. The prevalence rate was highest among sheep aged 1–4 years (19%), followed by those younger than 1 year (17.9%) and older than 4 years (13.3%). Female sheep exhibited a higher prevalence (19%) compared to males (16%). Block-wise prevalence was highest in Aul (27.9%), followed by Marshaghai (19.4%), Kendrapada (16.1%), and Derabish (5.88%). Hematological analysis revealed deviations in parameters such as hemoglobin, total erythrocyte count, total leukocyte count, and mean corpuscular volume, while packed cell volume, mean corpuscular hemoglobin, mean corpuscular hemoglobin concentration, and differential leukocyte count remained within normal ranges. Significant differences (P < 0.05) were observed in various parameters between Theileria-positive and negative sheep. However, there were no substantial variations noted among different age groups and genders of Theileria-positive sheep. PCR analysis identified an overall incidence of theileriosis at 17.57% in the study population, with sequences closely resembling Theileria luwenshuni isolates. This study confirms the high variability of the 18S small subunit rRNA gene among Theileria spp.

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supporting

confidence: 85%

Cross-sectional study on prevalence of theileriosis in Kendrapada sheep, Odisha

Mohanty,

Acharya,

Mishra

et al. 2024

Preprint

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Molecular identification and genetic characterization of Theileria and Anaplasma infection in sheep and goat of North Gujarat, India

Prajapati

Patel

et al. 2023

Parasitol Res

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Ticks and tick-borne diseases are signi cant health concerns in small ruminants. The present study was conducted to identify and characterize the genetic makeup of Theileria and Anapalsma species in sheep and goats located in different districts of North Gujarat. A total of 226 blood samples were collected from sheep (n=78) and goats (n=148) viz. Banaskantha (n=175), Patan (n=26), and Bhuj (n=25). PCR was carried out using a species-speci c primer of Theileria targeting 18S rRNA, SSU rRNA, and Anapalsma targetting the msp5 gene. A total of 29/78 (37.18%) sheep and 16/148 (10.81%) goats were found positive for Theileria.At the same time, 12/78 (15.38%) sheep and 38/148 (25.68%) goats were found positive for Anaplasma infection. Moreover, mixed infection was found in 10/226 (4.42%) sheep and goats. Tick-borne diseases were more prevalent in females compared to male sheep and goats. Theileria infection was more common in sheep, whereas Anapalsma was more dominant in goats of north Gujarat. Sequencing of six positive samples revealed the T. ovis and A. ovis infections in sheep and goats. Phylogenetic analysis of T. ovis SSU rRNA and Anaplasma spp. msp5 revealed that the pathogens identi ed in this study are clustered together, indicating similar molecular characteristics. Hyaloma and Rhipicephalus were common ticks identi ed in sheep and goats. We concluded that Theileria and Anaplasma are highly prevalent in the study area, and continuous monitoring of sheep and goats in North Gujarat is highly required. This is the rst scienti c report on Theileria and Anaplasma co-infections in sheep and goats from North Gujarat.

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